subject: Open in South Lake water source heat pump applications and simulation analysis - water source heat pump, heat - heat pump industry [print this page] Open in South Lake water source heat pump applications and simulation analysis - water source heat pump, heat - heat pump industry
Abstract: South China region rich in surface water, which is rich in low heat, for the construction of surface water source heat pump system. In 2004, Xiangtan City, Hunan Province, the construction of the city center of the lake in the experimental use of open-source heat pump cooling and heating system. The construction of the system water temperature before the run-time distribution of the simulation. Since the daily operation of the system into the lake water temperature monitoring, on the lake water source heat pump and air source heat pump's energy efficiency ratio were tested. Test results show that the lake water source heat pump EER and running stability are better than air-cooled heat pump.
Keywords: Open lake water source heat pump application simulation
1 Introduction Energy saving environmentally friendly ground source heat pump technology more and more attention. In accordance with the provisions of the standard terminology ASHRAEhandbook [1], ground source heat pump, including ground source heat pump, water source heat pump and ground source heat pump (SurfaceWaterHeatPump, SWHP). Ground source heat pump and ground water source heat pump in China has some of the more successful applications, but the surface water source heat pump research and application is still relatively small. In China, surface water-rich south, there are a large number of rivers and lakes. Yangtze River, Pearl River Delta and southeast coastal areas of surface water total volume of surface water in the country the proportion of the nearly 70% [2]. Compared with the air temperature, southern 2m below the water surface water temperature changed little during the day, water source heat pump is an ideal low heat.
Xiangtan urban centers have an area of 56000m2 artificial lake, since 2003, the Centre region and will be gradually built into municipal buildings, municipal buildings, radio and television center and the Grand Theatre. This four building very close apart, are not far from the lake, suitable for the construction of water source heat pump cooling and heating system. The summer of 2004 and the system is built City Hall and Grand Theatre cooling. This article describes the preliminary studies and system pilot test results and analysis.
2 System description Surface water source heat pump into closed and open forms. Closed system heat exchanger coil placed in the bottom of a lake or river bottom, circulating through the coil within the media and water for heat exchange. Heating in winter, generally using antifreeze as a circulation medium. This system capacity generally small. In the open loop system, from the bottom of a lake or river bottom of the pump, into the plate heat exchanger with circulating medium heat; in the southern region of higher water temperature in winter, water can also be sent directly after the heat pump, heat exchanger after a certain distance away from the location of water discharge point. Open system than the closed system of high heat transfer efficiency, low initial investment, suitable for larger systems, the system is open loop system.
Structure of the system shown in Figure 1. Central room in a public square in the basement, with the construction of the distance not to 280m. Lake average depth of 2.7m, water penetrated 3.5m, 2.5m below the surface water intake point in the office, away from the engine room of about 100m, lake water pumps and water treatment plant are located in the engine room, multiple screw-type heat pump units in parallel. To prevent the water temperature is low, the evaporator may be frozen, the export pumps in the lake has assisted heater, heat the steam from a nearby hotel. If the water temperature is below 7 , water heating needs in the auxiliary heater to 7 and then into the evaporator.
Wide open water of the water should not be directly through the unit, must first be refined. Use of chemical treatment dosage will pollute the lake. The system uses the physical approach to the lake. First of all, into the cyclone desander water to remove the water particles; then integrated water processor, use one of the high-frequency high voltage electric field and the complex filter system for biocide treatment and purification filters. On water quality before and after treatment were tested (see Table 1), sediment concentration and turbidity changes of these two most significant indicators after treatment can meet the unit requirements.
Table 1 Comparison of water quality before and after
